1600 MADISON ST 2016-01-01 MF Import

APPENDIX A FIELD EXPLORATION PROCEDURES The field exploration program for the replacement fire station consisted of drilling seven borings (BH-1 through BH-7) at the site at the approximate locations indicated on Figure 2 of the main text. The borings were drilled to depths ranging from 6 feet to as much as 60 feet below the existing ground surface. Grounda�ater monitoring wells were installed in the two deepest borings, borings BH-6 and BH-7. These borings extended to depths of 50 and 60 feet, respectively. (, The drilling, which was completed on October 23 and 24, 2000, was conduated by Cascade Drilling of Woodinville, Washington, under a subcontract to G-Logics. The borings were drilled { with a truck-mounted CME75 drill rig that was equipped with a 3%:-inch inside diametzr hollaw � stem auger. Soil samples were generally obtained from the borings at 2%:-foot intervals in the upper 10 feet of the borings and at 5-foot depth intervals thereafter. 'the sampling was i conducted in general accordance with ASTM test method D-1586 (Standazd Penetration Test (SPT) procedures) using a 2-inch outside diameter split-spoon sampler. The sampler was driven ( a distance of 18 inches below the tip of the auger using a 140-pound weight falling a distance of 30 inches. Blows were recorded for each 6-inch increment of sampler penetration. The number of blows required to produce the last 12 inches of sample penetration is defined as the Standard � Penetration Test (SPT) resistance (N-value). Thc N-valu� provides a qualitative measure of the relative density of cohesionless soil, or the relative consistency of fine-grained soils. To provide a lazgc� voluene of soil for potential environmental testing, the soil below a depth of 10 feet in borings BH-6 and BH-7 was sampled using 3-inch diameter split spoon samplers driven with a 300-pound hammer that was dropped a distance of 30 inches. The penetration resistance from this operation provides a qualitative indication of soil densiry, and is not considered equivalent to the SPT N-value. 1 Personnel Crom PanGEO and G-Logics were present throughout the field exploration program to observe the borings, assist in sampling, and to prepaze descriptive logs of the explorations. Soils were classified in general accordance with the guidelines shown on Figure A-1. Summary logs � of these bnrings aze included as Figures A-2 through A-8. A-1